var setting = document.getElementsByClassName('setting')[0];
var box = document.getElementsByClassName('box')[0];
box.onmouseover = function(){
    box.style.display = 'block';
}

box.onmouseout = function(){
    box.style.display = 'none';
}

setting.onmouseover = function(){
    box.style.display = 'block';
}
setting.onmouseout = function(){
    box.style.display = 'none';
}
